/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraSystem.h
virtual bool ChangeEmitterVersion ( const [FVersionedNiagaraEmitter](API\Plugins\Niagara\FVersionedNiagaraEmitter) & Emitter, const [FGuid](API\Runtime\Core\Misc\FGuid) & NewVersion )